When machining precision mechanical parts in mechanical processing plants, the surface of metal processing workpiece can not have scratches, scratches, errors mainly include spindle rotation errors, guide rail errors and transmission chain errors. Spindle rotation error refers to the change of the spindle relative to its average rotation axis, which will directly affect the accuracy of the workpiece. There are many requirements and regulations on processing technology to ensure the acceptance rate of parts leaving the factory.

Remove the jaws, process two M4 threaded holes, flatten the two steel plates with 1.5mm thick jaws, riveted 0.8mm thick hard copper plate 3 with aluminum countersunk head rivet, and tightened the jaws with M4 countersunk head screw 1 to form durable soft jaws. This can also protect hardware components from being clamped, with interchangeability.

For the workpiece, first clamping and then positioning, because clamping will certainly test the deformation of the workpiece, so to clamp, then positioning. For 6 point positioning, the machine processing plant to limit its freedom. When the handle of an Allen wrench is too short to concentrate, a pipe with an inner diameter slightly larger than the inner diameter of the wrench can be inserted into the milling groove for use as a long handle.

The main causes of spindle rotation error are spindle coaxiality error, bearing error, bearing coaxiality error, spindle winding and so on. Guide rail is the benchmark to determine the relative position of machine tool components, is the benchmark of machine tool movement.

Manufacturing error of guide rail in mechanical processing plant, uneven wear of guide rail and installation quality are important factors leading to the error of guide rail. Transmission chain error refers to the relative motion error between the two ends of the transmission chain. It is caused by the manufacturing and assembly errors of the components in the transmission chain and the wear and tear during use.

According to the experience of the machinery factory, the tool will inevitably wear during the cutting process, which will lead to the size and shape of the workpiece change. The influence of geometric error on machining error in mechanical processing plant varies with tool type: the manufacturing error of fixed size cutting tool directly affects the machining accuracy of workpiece, but its manufacturing error does not directly affect the machining error.

The function of the fixture is to make the workpiece equal to the correct position of the tool and machine tool, so the geometric error of the fixture has a great influence on the machining error (especially the position error). The thermal deformation has a great influence on the machining error, especially in the precision machining and large machining, the machining error caused by thermal deformation sometimes accounts for 50% of the total error of the workpiece.